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Glacial history of the Åsgardfonna Ice Cap, NE Spitsbergen, since the last glaciation

Glacial history of the Åsgardfonna Ice Cap, NE Spitsbergen, since the last glaciation


Title: Glacial history of the Åsgardfonna Ice Cap, NE Spitsbergen, since the last glaciation
Author: Allaart, Lis
Schomacker, Anders
Larsen, Nicolaj K.
Nørmark, Egon
Rydningen, Tom Arne
Farnsworth, Wesley Randall
Retelle, Michael
Brynjólfsson, Skafti   orcid.org/0000-0002-2792-1964
Forwick, Matthias
Kjellman, Sofia E.
Date: 2021-01-01
Language: English
Scope:
Department: Science Institute
Series: Quaternary Science Reviews; 251()
ISSN: 0277-3791
DOI: https://doi.org/10.1016/j.quascirev.2020.106717
Subject: Jöklarannsóknir; Loftslagsrannsóknir; Deglaciation; Glacier; Holocene history; Holocene thermal maximum; Neoglacial; Sediments; Sub-bottom data; Svalbard; Global and Planetary Change; Ecology, Evolution, Behavior and Systematics; Archeology (arts and humanities); Archeology; Geology
URI: https://hdl.handle.net/20.500.11815/2705

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Citation:

Allaart , L , Schomacker , A , Larsen , N K , Nørmark , E , Rydningen , T A , Farnsworth , W R , Retelle , M , Brynjólfsson , S , Forwick , M & Kjellman , S E 2021 , ' Glacial history of the Åsgardfonna Ice Cap, NE Spitsbergen, since the last glaciation ' , Quaternary Science Reviews , vol. 251 , 106717 . https://doi.org/10.1016/j.quascirev.2020.106717

Abstract:

The response of glaciers and ice caps to past climate change provides important insight into how they will react to ongoing and future global warming. In Svalbard, the Holocene glacial history has been studied for many cirque and valley glaciers. However, little is known about how the larger ice caps in Svalbard responded to Late Glacial and Holocene climate changes. Here we use lake sediment cores and geophysical data from Femmilsjøen, one of Svalbard's largest lakes, to reconstruct the glacial history of the Åsgardfonna Ice Cap since the last deglaciation. We find that Femmilsjøen potentially deglaciated prior to 16.1 ± 0.3 cal ka BP and became isolated from the marine environment between 11.7 ± 0.3 to 11.3 ± 0.2 cal ka BP. Glacial meltwater runoff was absent between 10.1 ± 0.4 and 3.2 ± 0.2 cal ka BP, indicating that Åsgardfonna was greatly reduced or disappeared in the Early and Middle Holocene. Deposition of glacial-meltwater sediments re-commenced in Femmilsjøen at c. 3.2 ± 0.2 cal ka BP, indicating glacier re-growth in the Femmilsjøen catchment and the onset of the Neoglacial. The glacier(s) in the Femmilsjøen catchment area reached sizes no smaller than their modern extents already at c. 2.1 ± 0.7 cal ka BP. Our results suggest that larger Svalbard ice caps such as Åsgardfonna are very sensitive to climate changes and probably melted completely during the Holocene Thermal Maximum. Such information can be used as important constraints in future ice-cap simulations.

Description:

Funding Information: Arve Johnsen (Office of the Governor of Svalbard) is thanked for providing access to the cabin in Vassfarbukta during fieldwork in 2018. The participants at the annual beach-clean-up of Svalbard are thanked for placing a fuel and wood depot at the field site. Truls Holm and Steinar Iversen (UiT) are thanked for help with preparation of geophysical equipment in Troms?. Dag Furberg Fjeld and Audun Tholfsen (UNIS logistics) are thanked for help during field preparation and safety checks during fieldwork. Drytech is acknowledged for field lunch supply. Andreas Grumstad is acknowledged for field assistance. We acknowledge ?rhus SeisLab (Katrine Juul Andresen and Ole R?n? Clausen) for help with import and interpretation of the geophysical data. Ole Bennike helped with identification of macrofossils. We kindly acknowledge two anonymous reviewers and editor Colm O'Cofaigh for improving the manuscript. Grant no. 17/01132-3 to Lis Allaart from the Svalbard Environmental Protection Fund covered the main part of fieldwork and laboratory analyses. The field costs for the 2018 campaign were partly funded by Arctic Field grant no. 282643 awarded to Lis Allaart by Svalbard Science Forum/Research Council of Norway, and grant no. 16/35 to Wesley Farnsworth from Svalbard Environmental Protection Fund. Funding Information: Grant no. 17/01132-3 to Lis Allaart from the Svalbard Environmental Protection Fund covered the main part of fieldwork and laboratory analyses. The field costs for the 2018 campaign were partly funded by Arctic Field grant no. 282643 awarded to Lis Allaart by Svalbard Science Forum/ Research Council of Norway , and grant no. 16/35 to Wesley Farnsworth from Svalbard Environmental Protection Fund. Publisher Copyright: © 2020 The Author(s)

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